Amazing, I just had some fun doing a "pretend quote" @ NCIX (my fav thing to do on a slow day at work) and came up with almost the exact same build (albeit the AMD version with a 780G motherboard and 4Gigs of Mushkin PC-6400). Sub-$1k Gaming boxes are not only possible now, they're powerful! (Thanks to the new 4800-series). Looks great!
I actually looked at that one for my "pretend build" quote and noticed that it's a lil too tall for the run-of-the-mill budget midtower at about 159-160mm tall. I used the Arctic Cooling PWM HSF and a couple of PWM sharing fans for the case as well.
If your running Crossfire, I think it would be worth while to get a X38 motherboard so you have full x16 on both slots...
Even if he/she isn't overclocking, still get a heatsink. Those Xigmatek ones are rather cheap.
I agree with the X38 motherboard! I would get a Cooler Master CM590 tower instead because the power supply sits at the bottom of the case. The bottom of the case have vents for the power supply to suck the air from outside the bottom of the case.